Hillary wants to raise Estate Taxes from 40% to 65% But why? Seriously, what is she doing?

Hillary wants to raise Estate Taxes from 40% to 65%,  but why?  Seriously,  what is she doing?  Understand that this top rate applies to only 253 American taxpayers.  How so, you ask?  Because there are only 253 families that have estates worth more than 500 million dollars.  So, again,  I ask,  "Why is she making a proposal that has virtually zero impact on our debt or the national economy.?"  

Could it be that this is a shameless effort on the part of Hillary,  to cater to her anti-rich constituency (the Millennials),  while being seen as an implicit/stealth friend of the filthy rich? 

Keep in mind that, in real life,  she is at the epee-center of big money politics and a friend of the high dollar investor/donor class  (emphasis on "donor"). I mean,  you do not go from zero to 135 million dollars of net worth by being a member of the common class.